It had been nearly a century since condors last flew over the Grand Canyon of the Colorado River. Hunted out almost to extinction in the early 1920s, the giant birds, once common throughout the Southwest and along the nearly unbroken chain of mountains extending from Canada deep into South America, had existed only in captivity for many years.

Thanks to an ambitious reintroduction program spearheaded by the Peregrine Fund in concert with state and federal wildlife agencies, Gymnogyps californianus now graces the skies of northern Arizona again.

In the 1980s, federal biologists removed 22 condors from the wild—the entire known population in the United States—and began an ambitious zoo-based breeding program to increase both their number and their genetic diversity.

On Dec. 12, 1996, biologists released six of those captive-bred condors at the Vermilion Cliffs, a federally managed unit of land near the eastern approach to the Grand Canyon, in the hope that the giants would multiply and reestablish themselves in their old habitat. Other birds were released there to add to their number over the following years; by 1999, 28 had been released in Arizona.

Initially, the great birds stayed close to the Vermilion Cliffs release site, which gave them plenty of room to roam. The remote 294,000-acre monument, tucked away at the northeastern edge of the Kaibab Plateau and the Grand Canyon’s North Rim, is a vast wonderland of stone, little visited even in the busiest seasons. Among its splendors are the cliffs themselves, named for their massive red wall of rock, which glows from afar, as well as Paria Canyon, a narrow slot canyon through which water perennially flows, unusually for high desert country.

There the condors found refuge, and there their numbers grew, if slowly, their range extending into the Grand Canyon proper and even farther west. They made the place their own. A friend of mine from Kingman, in the northwestern corner of Arizona, reported that while camping on a side canyon of Marble Canyon, where the Grand Canyon begins to open up, he was visited by four condors who asserted their ownership of the place, pulling a sleeping bag out of a backpack while its owner was away from the campsite and pecking a few holes in it while dragging the pack itself a couple of hundred yards away.

In October 2005, I saw one, and only one, California condor out beyond the far western edge of the national park, flying above the Aubrey Cliffs. Other condors, a Park Service biologist told me, were probably nearby, though some of the birds have been known to take off on their own.

A young condor released in 1998, for example, winged its way all the way to Hurricane, Utah, a couple of hundred miles from its release site, and took up residence in a tree at an RV resort. It showed no wariness whatever of humans, for which reason it was returned to captivity to be released in an area even less populated than the Colorado Plateau country.

The Arizona portion of the condor recovery program, nearly 15 years later, can safely be called a success, if perhaps a mixed one—for some of the released condors have died, one shot to death in Grand Canyon National Park, others killed by power lines, the bane of birds of many kinds.

In 2000, four condors died of lead poisoning from eating the carcass of a cow that had been killed with a shotgun, that favorite weapon of yahoos everywhere. Biologists observed that this matched a long-standing pattern, for condor mortality in and near human settlements is often caused by bullets—not bullets directly piercing the birds, that instead, but instead death by the bullets that felled the carrion that condors eat. As one such biologist remarked to Audubon magazine in 2000, “A little chunk of expended metal helped bring this great species to its knees.”

Meanwhile, in next-door California, a companion program has been more checkered; as of 2000, some three dozen condors had been released, but with many more victims of gunshot. Some hunting organizations protested the release, fearing that protection for condors would remove productive hunting grounds from public use. Even some environmentalists deemed the reintroduction program a species of playing God with a species that seemed almost certainly destined for extinction, with renowned activist Kenneth Brower memorably declaring, “If it is time for the condor to follow Teratornis [the long-extinct Pleistocene ‘monster bird’], it should go out unburdened by radio transmitters.”

Even with the bullets and opposition, more and more condors were fitted with those transmitters and released into the wild, where nature took its course. By 2010 their number had grown to 189, with a population of 28 condors at Pinnacles National Monument alone.

That year saw Pinnacles enter into a partnership with Argentina’s Parque Nacional Quebrada del Condorito in Cordoba. There, in the sierra, biologists have been conducting a parallel reintroduction program involving the California condor’s cousin, the larger Andean condor—in fact, the largest flying bird on Earth. The Andean condor had not been whittled down to quite such perilous numbers, but even so, its population had fallen to the point that biologists considered it threatened. The partnership is expected to yield improved channels of communication and sharing of scientific data, though what that means in practical terms has yet to be seen.

Can the condor escape the fate that seemed so certain only a quarter of a century ago? That has yet to be determined, too, but the signs seem promising. The species is surviving, and it has every chance of reaching the biologists’ larger goals—in the case of Arizona, to have at least two distinct, non-interacting populations of 150 birds apiece. Lead and electricity willing, the great birds seem well on their way.

"Service Animal" Scammers (New Yorker): An increasing number of your neighbors have been keeping company with their pets in human-only establishments simply by claiming that the creatures are their licensed companion animals and are necessary to their mental well-being.

Why London’s pig café pop-up is a terrible idea for pigs: Teacup pigs are adorable. Unfortunately, they’re also a complete fabrication. But that isn’t stopping a local London specialty breeder and Yelp from putting on an adoption event to educate the public on “proper” micro pig care.